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Securities - Summary of Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | $ 190,508 | $ 189,005
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 1,339 | 352
Available-for-sale Securities, 12 Months or Longer, Fair Value | 25,821 | 21,163
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 832 | 582
Available-for-sale Securities, Fair Value, Total | 216,329 | 210,168
Available-for-sale Securities, Unrealized Losses, Total | 2,171 | 934
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 483 | 21
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 4 |
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 9 |
Held-to-maturity Securities, Fair Value, Total | 492 | 21
Held-to-maturity Securities, Unrealized Losses, Total | 4 |
U.S. Treasuries [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 103,705 | 139,762
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 920 | 45
Available-for-sale Securities, Fair Value, Total | 103,705 | 139,762
Available-for-sale Securities, Unrealized Losses, Total | 920 | 45
U.S. Federal Agencies [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 71,511 | 46,948
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 357 | 118
Available-for-sale Securities, 12 Months or Longer, Fair Value | 9,619 | 5,969
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 48 | 35
Available-for-sale Securities, Fair Value, Total | 81,130 | 52,917
Available-for-sale Securities, Unrealized Losses, Total | 405 | 153
Mortgage Backed Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 3 | 59
Available-for-sale Securities, 12 Months or Longer, Fair Value | 14,834 | 14,844
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 567 | 543
Available-for-sale Securities, Fair Value, Total | 14,837 | 14,903
Available-for-sale Securities, Unrealized Losses, Total | 567 | 543
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 7 | 21
Held-to-maturity Securities, 12 Months or Longer, Fair Value | 9 |
Held-to-maturity Securities, Fair Value, Total | 16 | 21
States and Political Subdivisions [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value | 15,289 | 1,932
Available-for-sale Securities, Less than 12 Months, Unrealized Losses | 62 | 47
Available-for-sale Securities, 12 Months or Longer, Fair Value | 779 | 245
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 67 | 1
Available-for-sale Securities, Fair Value, Total | 16,068 | 2,177
Available-for-sale Securities, Unrealized Losses, Total | 129 | 48
Held for Investment |  |
Held-to-maturity Securities, Less than 12 Months, Fair Value | 476 |
Held-to-maturity Securities, Less than 12 Months, Unrealized Losses | 4 |
Held-to-maturity Securities, Fair Value, Total | 476 |
Held-to-maturity Securities, Unrealized Losses, Total | 4 |
Other Securities [Member] |  |
Available for Sale |  |
Available-for-sale Securities, Less than 12 Months, Fair Value |  | 304
Available-for-sale Securities, Less than 12 Months, Unrealized Losses |  | 142
Available-for-sale Securities, 12 Months or Longer, Fair Value | 589 | 105
Available-for-sale Securities, 12 Months or Longer, Unrealized Losses | 150 | 3
Available-for-sale Securities, Fair Value, Total | 589 | 409
Available-for-sale Securities, Unrealized Losses, Total | $ 150 | $ 145

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